set_base_fee_per_gas
Call v210 → current #0Manually sets the EIP-1559 base fee (admin only).
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with set_base_fee_per_gas, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch which emits events: NewBaseFeePerGas and modifies storage: BaseFeePerGas, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: developers
The Big Picture
Override automatic EIP-1559 calculation for emergencies or initialization.
Use Cases
- Emergency fee adjustment
- Initialize after upgrade
Input Parameters
| # | Name | Type | Description |
|---|---|---|---|
| 0 | fee | U256 | fee (U256) |
Permissions
Origin
Unknown
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Admin/root privileges
- Valid U256 fee
Effects
Events Emitted
Storage Modified
Postconditions
- BaseFeePerGas updated
- NewBaseFeePerGas emitted
Side Effects
- Affects all subsequent transaction fees
Code Examples
import { ApiPromise, WsProvider } from "@polkadot/api";
import { stringCamelCase } from "@polkadot/util";
const provider = new WsProvider("wss://entrypoint-finney.opentensor.ai:443");
const api = await ApiPromise.create({ provider });
// Build set_base_fee_per_gas call
const fee = 0 as any /* U256 */;
const call = api.tx[stringCamelCase("BaseFee")][stringCamelCase("set_base_fee_per_gas")](
fee
);Runtime Info
- Pallet Index
- 25
- Call Index
- 0
- First Version
- v210
- Current Version
- v393